As far as I understood Signal is opensource but it is not present in f-droid. I remember reading in the forum that the app devs didn’t agree with distributing the app outside the google play. As 2018, is there any update on this? Will we ever see Signal in f-droid?

"original app author has been notified (and supports the inclusion)." - https://gitlab.com/fdroid/rfp/issues/new This is against one of the four essential freedoms: "The freedom to redistribute copies so you can help...